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December Weather in Jefferson, United States

Last updated: June 24, 2025

In December, the average temperature in Jefferson, United States hovers around 11°C (52°F), offering a pleasant climate for outdoor activities. However, be prepared for a range of temperatures, with minimums dipping to -3°C (27°F) and maximums soaring to 28°C (83°F). Additionally, anticipate 125 mm (4.9 in) of precipitation spread over 9 days, contributing to an average humidity of 88%. Perfect weather for those who enjoy a touch of moisture in the air!

December Temperature in Jefferson

In December in Jefferson, the average temperature is 11°C (52°F). Maximums can reach 28°C (83°F) and minimums can be as low as -3°C (27°F). This diverse range of temperatures makes Jefferson an interesting destination for travelers prepared for both warm and chilly weather.

December Weather in Jefferson: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Jefferson, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Jefferson, December typically has an average temperature of 11°C (52°F), with highs reaching up to 28°C (83°F) and lows dropping to around -3°C (27°F).
JanFebMarAprMayJunJulAugSepOctNovDec485160657481848379685652
Data source: Temperature data for Jefferson generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Jefferson

In Jefferson in December, the total precipitation amount is 125 mm (4.9 in) recorded over a span of 9 days.

December Precipitation Trends in Jefferson

The chart displays monthly precipitation patterns in Jefferson, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Jefferson, December typically receives around 125 mm (4.9 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec1051491231701561029080929959125
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Jefferson

In Jefferson in December, humidity is 88%. With an average temperature of 11°C (52°F), this humidity feels like a heavy blanket wrapping around you, making travel uncomfortable and the air feel thick, encouraging you to seek shelter or stay hydrated as you explore.

December Average Humidity in Jefferson

This chart illustrates the average monthly humidity levels in Jefferson, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Jefferson is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%80%78%79%81%77%72%65%63%70%82%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Jefferson

In Jefferson in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Jefferson for better planning.

Maximum UV Index Levels in Jefferson for December

The chart shows the monthly maximum UV Index (UVI) for Jefferson in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Jefferson typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec478101111111110864
Data source: Jefferson December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How December Weather in Jefferson Compares to Other Months

Weather in Jefferson varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Jefferson, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Jefferson, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather9°C (48°F)105 mm (4.1 inches)82%moderate
February Weather10°C (51°F)149 mm (5.9 inches)80%high
March Weather16°C (61°F)123 mm (4.9 inches)78%very high
April Weather18°C (65°F)170 mm (6.7 inches)79%very high
May Weather23°C (74°F)156 mm (6.1 inches)81%extreme
June Weather27°C (81°F)102 mm (4.0 inches)77%extreme
July Weather29°C (84°F)90 mm (3.5 inches)72%extreme
August Weather29°C (84°F)80 mm (3.2 inches)65%extreme
September Weather26°C (79°F)92 mm (3.6 inches)63%very high
October Weather20°C (68°F)99 mm (3.9 inches)70%very high
November Weather13°C (56°F)59 mm (2.3 inches)82%high
December Weather11°C (52°F)125 mm (4.9 inches)88%moderate

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